Question 1

The two most efficiently packed unit cells have the hexagonal closest-packed and the ________ the atomic arrangements.

Accepted Answer

cubic closest-packed

Question 2

A compound having A ions on each corner and B ions on each face of a cubic unit cell has the empirical formula ________.

Accepted Answer

AB<sub>3</sub>

Question 3

Which of the following compounds has the highest boiling point?

Accepted Answer

A) H2O 
B) HCl 
C) N2 
D) Ar  
A) H2O 
B) HCl 
C) N2 
D) Ar  A

Question 4

A crystalline solid of unknown origin forms an aqueous solution that conducts an electrical current.The solid has a high melting point and shatters when struck with a hammer.The solid is likely to be

Accepted Answer

A) a covalent network solid. 
B) an ionic solid. 
C) a metallic solid. 
D) a molecular solid. 
A) a covalent network solid. 
B) an ionic solid. 
C) a metallic solid. 
D) a molecular solid.

Question 5

The magnitude of the heats of vaporization,fusion and sublimation of a substance reflect the

Accepted Answer

A) density of the substance. 
B) magnitudes of the boiling and melting points of the substance. 
C) strength of the covalent bonds between atoms in each molecule of the substance. 
D) strength of the intermolecular forces of the substance. 
A) density of the substance. 
B) magnitudes of the boiling and melting points of the substance. 
C) strength of the covalent bonds between atoms in each molecule of the substance. 
D) strength of the intermolecular forces of the substance.

Question 6

The phase diagram of a substance is shown below.  
-The approximate normal melting point of this substance is

Accepted Answer

A) 100 K. 
B) 190 K. 
C) 300 K. 
D) 430 K. 
A) 100 K. 
B) 190 K. 
C) 300 K. 
D) 430 K.

Question 7

The temperature and pressure at which all three phases can coexist in equilibrium is

Accepted Answer

A) 0.25 atm and 110°C. 
B) 1.0 atm and 140°C. 
C) 1.25 atm and 300°C. 
D) 0.45 atm and 130°C. 
A) 0.25 atm and 110°C. 
B) 1.0 atm and 140°C. 
C) 1.25 atm and 300°C. 
D) 0.45 atm and 130°C.

Question 8

How many atoms are in one face-centered cubic unit cell of a metal?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 9

Cubic closest-packing

Accepted Answer

A) has a body-centered cubic unit cell. 
B) has a face-centered cubic unit cell. 
C) has a simple cubic unit cell. 
D) has the same unit cell as hexagonal closest-packing. 
A) has a body-centered cubic unit cell. 
B) has a face-centered cubic unit cell. 
C) has a simple cubic unit cell. 
D) has the same unit cell as hexagonal closest-packing.

Question 10

.  
-If figure (1)represents the vapor pressure of water at 25°C,which figure represents the vapor pressure of water at 45°C?

Accepted Answer

A) figure (2) 
B) figure (3) 
C) figure (4) 
A) figure (2) 
B) figure (3) 
C) figure (4)

Question 11

How much heat is released when 95.0 g of steam at 100.0°C is cooled to ice at -15.0°C? The enthalpy of vaporization of water is 40.67 kJ/mol,the enthalpy of fusion for water is 6.01 kJ/mol,the molar heat capacity of liquid water is 75.4 J/(mol ∙ °C),and the molar heat capacity of ice is 36.4 J/(mol ∙ °C).

Accepted Answer

A) 54.8 kJ 
B) 247 kJ 
C) 289 kJ 
D) 314 kJ 
A) 54.8 kJ 
B) 247 kJ 
C) 289 kJ 
D) 314 kJ

Question 12

Consider a compound that undergoes sublimation at 125°C and a pressure of one atm.Which of the following could be a heating curve appropriate for heating the compound from 100°C to 150°C?

Accepted Answer

A) graph a 
B) graph b 
C) graph c 
D) graph d 
A) graph a 
B) graph b 
C) graph c 
D) graph d

Question 13

Which type of spherical packing has the most unused space?

Accepted Answer

A) body-centered cubic 
B) cubic closest-packed 
C) cubic closest-packed and hexagonal closest-packed 
D) simple cubic 
A) body-centered cubic 
B) cubic closest-packed 
C) cubic closest-packed and hexagonal closest-packed 
D) simple cubic

Question 14

Use the diagram below to answer the following questions.  
-Melting occurs along the

Accepted Answer

A) AC line. 
B) CB line. 
C) CD line. 
D) All of these 
A) AC line. 
B) CB line. 
C) CD line. 
D) All of these

Question 15

-If figure (1)represents the vapor pressure of water at 25°C,which figure represents the vapor pressure of ethanol,CH3CH2OH at 25°C?

Accepted Answer

A) figure (2) 
B) figure (3) 
C) figure (4) 
A) figure (2) 
B) figure (3) 
C) figure (4)

Question 16

The phase change H2(g)→ H2(s)is called ________,and the enthalpy change,ΔH,for this phase change has a ________ sign.

Accepted Answer

deposition

Question 17

First-order diffraction of X-rays with d = 154.2 pm at an angle of 32.5° is caused by layers of atoms in a crystalline solid with a spacing of ________ pm.

Accepted Answer

The answer of First-order diffraction of X-rays with d =...

Question 18

Which of the following forms an ionic solid?

Accepted Answer

A) Au 
B) CH3NH2   
C) NH4Cl  
D) N H3 
A) Au 
B) CH3NH2   
C) NH4Cl  
D) N H3

Question 19

Of C2H5OH and C3H5(OH)3 the one expected to have the higher viscosity is ________,and the one expected to have the higher surface tension is ________.

Accepted Answer

Question 20

Ethyl chloride,C2H5Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes;its heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 10.0 g of ethyl chloride?

Accepted Answer

A) 4.09 kJ 
B) 170 kJ 
C) 264 kJ 
D) 1700 kJ 
A) 4.09 kJ 
B) 170 kJ 
C) 264 kJ 
D) 1700 kJ

Exam 11: Liquids, solids, and Phase Changes

The two most efficiently packed unit cells have the hexagonal closest-packed and the ________ the atomic arrangements.

A compound having A ions on each corner and B ions on each face of a cubic unit cell has the empirical formula ________.

Which of the following compounds has the highest boiling point?

A crystalline solid of unknown origin forms an aqueous solution that conducts an electrical current.The solid has a high melting point and shatters when struck with a hammer.The solid is likely to be

The magnitude of the heats of vaporization,fusion and sublimation of a substance reflect the

The phase diagram of a substance is shown below. -The approximate normal melting point of this substance is

The temperature and pressure at which all three phases can coexist in equilibrium is

How many atoms are in one face-centered cubic unit cell of a metal?

Cubic closest-packing

. -If figure (1)represents the vapor pressure of water at 25°C,which figure represents the vapor pressure of water at 45°C?

Consider a compound that undergoes sublimation at 125°C and a pressure of one atm.Which of the following could be a heating curve appropriate for heating the compound from 100°C to 150°C?

Which type of spherical packing has the most unused space?

Use the diagram below to answer the following questions. -Melting occurs along the

-If figure (1)represents the vapor pressure of water at 25°C,which figure represents the vapor pressure of ethanol,CH3CH2OH at 25°C?

The phase change H2(g)→ H2(s)is called ________,and the enthalpy change,ΔH,for this phase change has a ________ sign.

First-order diffraction of X-rays with d = 154.2 pm at an angle of 32.5° is caused by layers of atoms in a crystalline solid with a spacing of ________ pm.

Which of the following forms an ionic solid?

Of C2H5OH and C3H5(OH)3 the one expected to have the higher viscosity is ________,and the one expected to have the higher surface tension is ________.

Ethyl chloride,C2H5Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes;its heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 10.0 g of ethyl chloride?

Chemical Tools: Experimentation and Measurement

Atoms, molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

Covalent Bonding and Electron-Dot Structures

Covalent Compounds: Bonding Theories and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

The Main-Group Elements

Connections to Organic and Biological Chemistry

Filters

-If figure (1)represents the vapor pressure of water at 25°C,which figure represents the vapor pressure of ethanol,CH₃CH₂OH at 25°C?

The phase change H₂(g)→ H₂(s)is called ,and the enthalpy change,ΔH,for this phase change has a sign.

Of C₂H₅OH and C₃H₅(OH)₃ the one expected to have the higher viscosity is ,and the one expected to have the higher surface tension is .

Ethyl chloride,C₂H₅Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes;its heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 10.0 g of ethyl chloride?